Definition: You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
Input: Question: What will come in place of the x in the following Number series? 2, 7, 32, 157, 782, x

 Option A: 3707

 Option B: 3790

 Option C: 3910

 Option D: 3907

 Option E: 3970

Option D